The ioquake3 community effort to continue supporting/developing id's
3D Procedural Game Engine Using OpenGL
2D JavaScript Physics Engine
High performance UI layout library in C
The HTML5 Creation Engine
Zig game engine & graphics toolkit
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Game engine supporting many 3D/2D formats and graphic effects
Orx: Portable Game Engine
A simple cross-platform game engine for creating old-school 2D games
Free, open source game engine online
Amateur 3D Game Engine
Here we're trying to create the easiest open-source game engine.
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Haskell game engine library for roguelike dungeon crawlers
Modified source engine (2017) developed by valve and leaked in 2020
The multiplayer game engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Entitas is a super fast Entity Component System (ECS) Framework
Urho3D Game engine
A cross-platform, open-source, pure C game engine for mobile game
Mini game engine for games104
Engo is an open-source 2D game engine written in Go
Retro game engine for creating games like it's 1997
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3